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Application filed by Ericsson Telefon Ab L MfiledCriticalEricsson Telefon Ab L M
Priority to PT7730783ApriorityCriticalpatent/PT77307B/en
Publication of PT77307ApublicationCriticalpatent/PT77307A/en
Publication of PT77307BpublicationCriticalpatent/PT77307B/en
Sub-Exchange Stations And Push- Button Telephones
(AREA)
Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges
(AREA)
Abstract
Time-division-multiplex channel set-ups are provided between a bus, connected to all modules, and PCM links, each going from its own module. The number of links is less than the number of modules. Set-ups are also established between groups of subscriber lines, connected to the modules, and the bus, and between the subscriber line group and the link connected to the same module. The bus must always be used for a set-up to an arbitrary link from a subscriber line, the line circuit module of which is solely connected to the bus. To avoid congestion on the bus as far as possible the bus is only used for a set-up to an arbitrary link from a subscriber line, the module of which is connected to the bus and to one of the links, solely if a given number of the TOM channels of the link associated with this module are busy.
Circuit arrangement for telecommunication switching systems, in particular PCM time-division multiplex telephone switching systems with a central switching network and connected sub-switching networks.
CIRCUIT ARRANGEMENT FOR CENTRALLY CONTROLLED TIME-MULTIPLEX TELECOMMUNICATIONS EXCHANGE SYSTEMS, IN PARTICULAR PCM TELEPHONE EXCHANGE SYSTEMS WITH TERMINAL GROUPS CONNECTED TO A SWITCHING MATRIX.
Method for operating telecommunication switching systems, in particular PCM time-division multiplex telephone switching systems, with a central switching network and with decentralized sub-switching networks connected to the same.